Problem behavior in the elementary school.
D000124:Achievement; D000342:Affective Symptoms; D000374:Aggression; D002648:Child; D002653:Child Behavior Disorders; D003863:Depression; D005006:Ethnicity; D005163:Factor Analysis, Statistical; D006801:Humans; D006948:Hyperkinesis; D009042:Motivation; D010553:Personality Development; D012574:Schools